Former Finks bikie Dylan Jessen jailed over gun found in his girlfriend's underwear

Former Finks bikie Dylan Jessen has been sentenced to three years in prison for firearms offences over a loaded pistol found in underwear his girlfriend was wearing.

Jessen, 23, admitted to offences including possessing an unregistered firearm, defacing it to remove the serial number and failing to secure ammunition separately.

The Adelaide District Court was told the weapon was found at Jessen's Blakeview house in November last year, and photos of members of the Hells Angels were found in the glovebox of Jessen's car.

Jessen's lawyer, David Edwardson QC, told the court the former treasurer of the Finks obtained the gun after police had informed him he was a target of the Hells Angels, a day before his arrest.

Judge Steven Millsteed said the gun contained live rounds and it was clear Jessen had it because of the feud between gangs, but he could not determine if Jessen had an offensive or defensive intention.

"At the time, Mr Jessen, you were a member of the Finks Motorcycle Gang. You held the position of treasurer and were a member of the terror team, as evidenced by the words "terror team" tattooed on your face," he said.

You held the position of treasurer and were a member of the terror team, as evidenced by the words "terror team" tattooed on your face.

Judge Steven Millsteed

"The fact that you had a loaded pistol ready to fire is of grave concern. You chose to live in a world that exposed you to such risks. The courts must do what they can to stamp out this wild west mentality.

"It should be noted that on the day before your arrest you had received information from police that you were a likely target of the Hells Angels."

Judge Millsteed could not determine when the firearm was acquired but said it was likely to have been before the discussion between Jessen and police.

Judge accepts Jessen's written promises

The judge said Jessen had written a letter to the court about his desire to leave the Finks, not join the Mongols as many other Finks had done and be a positive influence for his infant son.

"I hope that what you say is true," he said.

"I think you may be genuine in your claims and I'll give you the opportunity to demonstrate that."

He set a non-parole term of 18 months to commence from last February when Jessen was arrested.

Jessen's now ex-girlfriend Jaymee Renee Noble, 23, was given a five-month suspended sentence after admitting to firearms possession.

Judge Millsteed said she had been in a relationship with Jessen for about four weeks at the time the gun was found.

"I accept that your action in hiding the pistol was a rash and impulsive act, which you deeply regret," he said.